Hey ya'll, I'm Eric. Just bought my first house, so you'll prob. be seeing me a lot. Got a question about what fitting I need, and If what I have in mind is appropriate. My down stairs laundry room shares a wall with my down stairs bathroom. above the laundry room is the upstairs master bath. so this wall has plenty of plumbing in it. the previous occupants had the washer drain (p trap up) out side of the wall, along with several feet of both the hot and cold water with tee's and another couple feet then another valve. 2 hot valves, 2 cold valves, and plumbing all over outside the wall. I have the water situation under control, I just need to know what kind of fitting to use to add a 3x2 wye to one of the vertical stacks. I cannot spread the 3" apart to get a normal slip joint in there. Is there some cool fittings just for this application? I have attached a rough sketch of my situation. please let me know if you see any problems with my idea. Thanks